So if your mindset when you watch porn is "let's see some naked girls" or something like that your sexual desire in real life will increase, which is bad. If on the other hand you think "these pornostars I can have for free are so hot and 99% of the women I know irl are witches compared to them" then you won't be attracted to real women anymore. And I guarantee you it feels so liberating when a woman is trying to manipulate you while you think "I'm not attracted to you, you're really ugly compared to the pornostars I can have all the time"...